JavaScript takes a very relaxed attitude towards variables and functions. Variables are typeless, and the distinction between functions, objects, and arrays is blurry at best. By contrast, Java is an extremely strict language.
All Java variables have an explicit data type. Types may only be converted to one another under very well defined conditions, and only by using explicit type conversion functions. Java also enforces static name binding, instead of JavaScript’s dynamic binding. It is impossible to reference an undefined function.
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